cummingsc
google. is there something it can't do?
Robbykills
I've also read about turning a 5-speed hub into a 3-speed fixed with a 4th coasting gear. however if i remember correctly he ended up with a bunch of backlash in one of the gears, and going from neutral to engaged was a bit dicey. I might be making this up though, and I can't seem to find the article.

a ha! sturmey fixing instructions!
http://www.users.globalnet.co.uk/~hadland/fixed.pdf